These 6.6L PYREX general-purpose cylindrical chromatography tanks have tops ground to within 0.1mm tolerances to insure a tight cover fit. Covers are not supplied. Do not use with heat, pressure, or vacuum applications. No cover. Material: Borosilicate Glass Code 7740. Capacity: 6.6L. Jar Style: Chromatography Tank. Top Style: Ground. Feature: Reusable. Outer Diameter: 152mm. Height: 457mm. Corning#: 6945-6L.